These Magnetic Bracelet are ideal if you suffer from Sciatica, Arthritis, Rheumatoid Arthritis etc. These Magnetic Bracelets are made from Polypropylene Material which is Strong but Light & Comfortable & ONE SIZE FITS ALL, due to its adjustable strap. These Magnetic Bracelets are fitted with one STRONG 2000 Gauss Rare Earth Magnet. These magnets usually last a lifetime although there may be wear & tear with the Material over time. The penetration of these magnets are one of the strongest on the market & we continue to get great results with this particular type of Magnetic Bracelet.